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Abstract #0857

Improvements in in vivo imaging and temperature mapping using passive “propeller-beanie” antenna in transcranial MR-guided focused ultrasound

Xinqiang Yan1,2, Steven P. Allen3, Craig H. Meyer3, and William A. Grissom1,2,4
1Vanderbilt University Institute of Imaging Science, Nashville, TN, United States, 2Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, TN, United States, 3Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, United States, 4Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, United States

Transcranial MR-guided focused ultrasound (tcMRgFUS) neurosurgery is a non-invasive treatment for essential tremor and many emerging applications. In FDA-approved Insightec tcMRgFUS system, however, RF reflections create curved dark bands in brain images. In this work, we reported the first B1+ and temperature maps in a healthy volunteer with passive crossed wires to alleviate B1+ dark bands and inhomogeneity in a tcMRgFUS system. Consistent with simulation results and previous experimental results in phantoms, the “propeller-beanie” antenna can significantly alleviate dark band artifacts in Insightec tcMRgFUS system, which improves temperature precision and may enable the use of diffusion imaging to monitor treatment.

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